Low-noise chopper amplifier design for low-frequency induction magnetometers

被引：1

作者：

Tang, Yao ^{[1
,2
]}

Xi, Zhenzhu ^{[1
,2
]}

Chen, Xingpeng ^{[3
]}

Long, Xia ^{[3
]}

机构：

[1] Cent South Univ, Sch Geosci & Infophys, Changsha 410083, Peoples R China

[2] Cent South Univ, Key Lab Metallogen Predict Nonferrous Met, Minist Educ, Changsha 410083, Peoples R China

[3] Hunan 5D Geosci Co Ltd, Changsha 410025, Peoples R China

来源：

JOURNAL OF GEOPHYSICS AND ENGINEERING | 2023年 / 20卷 / 06期

关键词：

magnetotelluric method; induction magnetometers; low-noise chopper amplifier; sensitivity; equivalent input magnetic field noise; COIL; SENSORS;

D O I：

10.1093/jge/gxad082

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Induction magnetometers (IM) are commonly used in the magnetotelluric method for exploration. 1/f noise in the low-frequency band of the preamplifier reduces the signal-to-noise ratio of IM, thus affecting the exploration results. We designed a low-noise chopper amplifier with equivalent input voltage noise of 9.8 nV/root Hz at 1 mHz, 2.1 nV/root Hz at 0.01 Hz, and 1.9 nV/root Hz at 0.1 Hz; 1/f noise corner frequency of 8 mHz, and equivalent input current noise of 200 fA/root Hz at 1 mHz, 100 fA/root Hz at 0.01 Hz, and 60 fA/root Hz at 0.1 Hz. The IM using this chopper amplifier is 85.5 cm long, 6.0 cm in diameter, and has a total weight of 4.8 kg. Its sensitivity is 300 mV/nT during 20 Hz and 1 kHz, with a theoretical equivalent input magnetic field noise of 0.3 pT/root Hz at 1 Hz and a measurement frequency range of 1 mHz to 1 kHz.

引用

页码：1269 / 1278

页数：10

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